main.js (1589B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2018 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 'use strict'; 20 21 // MODULES // 22 23 var isSharedArrayBuffer = require( './../../is-sharedarraybuffer' ); 24 var GlobalSharedArrayBuffer = require( './sharedarraybuffer.js' ); 25 26 27 // MAIN // 28 29 /** 30 * Tests for native `SharedArrayBuffer` support. 31 * 32 * @returns {boolean} boolean indicating if an environment has `SharedArrayBuffer` support 33 * 34 * @example 35 * var bool = hasSharedArrayBufferSupport(); 36 * // returns <boolean> 37 */ 38 function hasSharedArrayBufferSupport() { // eslint-disable-line id-length 39 var bool; 40 var b1; 41 var b2; 42 43 if ( typeof GlobalSharedArrayBuffer !== 'function' ) { 44 return false; 45 } 46 // Test basic support... 47 try { 48 b1 = new GlobalSharedArrayBuffer( 16 ); 49 b2 = b1.slice( 4, 8 ); 50 bool = ( 51 isSharedArrayBuffer( b1 ) && 52 isSharedArrayBuffer( b2 ) && 53 b1.byteLength === 16 && 54 b2.byteLength === 4 55 ); 56 } catch ( err ) { // eslint-disable-line no-unused-vars 57 bool = false; 58 } 59 return bool; 60 } 61 62 63 // EXPORTS // 64 65 module.exports = hasSharedArrayBufferSupport;